Ancient Copper Dragon
CR 18 Gargantuan Dragon Armor Class 21 (natural armor) Hit Points 297 Speed 40 ft., climb 40 ft., fly 80 ft. Perception 27 Stealth 16ResistantIf the dragon fails a save, it can choose to succeed instead. Immune acid Sensesdarkvision 120 ft., keensense 60 ft. Languages Common, Draconic STR DEX CON …